Area for a triangle =base • Height/2
So the error is they forgot to divide by two.
A=20(9)/2=90ft^2.
Answer:
<u>Step-by-step explanation:</u>
Answer:
Step-by-step explanation:
Part 1) Find the measure of angle 1
we know that
-----> by supplementary angles
Part 2) Find the measure of angle 2
we know that
-----> by alternate exterior angles
Part 3) Find the measure of angle 3
we know that
-----> by vertical angles
Part 4) Find the measure of angle 4
we know that
------> by corresponding angles
Part 5) Find the measure of angle 5
we know that
-----> by vertical angles
so
Part 6) Find the measure of angle 6
we know that
-----> by supplementary angles
we have
substitute
14. R= 60°
16. Equilateral and acute